.bz2 extension handling

The .bz2 extension belongs to the bzip2 compression utility which replaces gzip. You may unpack the .tar.bz2 files directly via the 'tar xjf <file>' command (the newer version of tar) or 'tar xIf <file>' command (the older version of tar) or 'bzip2 -c | tar xf -' command (all versions of tar).